java - Spring - 禁用绑定(bind)异常(针对特定属性)

Question

在我正在使用 Spring 2.5.6.SEC01 的 Web 应用程序中，我基本上有一个整数字段，它使用一个数字来确定要滚动到哪个页面。要求发生了变化，我们不再希望显示错误消息，而是在用户输入无效数字(例如“adfadf”)时忽略用户的输入。

我在读到您可以通过以下方式做到这一点:

TypeMismatch.property=一些新的错误信息

但是，在尝试之后，我们仍然收到原始错误消息:java.lang.Integer.TypeMismatch=...

我只想为给定的属性禁用此消息。我怎样才能做到这一点？我仍然希望绑定(bind)自动发生，我只是不想现在听到它。

沃尔特

Answer 1

根据 DefaultMessageCodesResolver

如果代码“typeMismatch”，对象名称“user”，字段“age”

• typeMismatch.user.age
• typeMismatch.age
• 类型不匹配.int
• 类型不匹配

所以你应该得到(我想你的 commandName 被称为 command 并且你的属性是 age)根据你的代码进行调整

typeMismatch.command.age
typeMismatch.age
typeMismatch.java.lang.Integer
typeMismatch

注意第三段代码

typeMismatch.java.lang.Integer

它会解决你想要的

更新

我创建了一个 Person 命令类

public class Person implements Serializable {

    private Integer age;

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

}

和个人 Controller

public class PersonController extends SimpleFormController {

    public PersonController() {
        setCommandClass(Person.class);
        setValidator(new Validator() {
            public boolean supports(Class clazz) {
                return clazz.isAssignableFrom(Person.class);
            }

            public void validate(Object command, Errors errors) {
                rejectIfEmpty(errors, "age", "Age is required");
            }
        });
    }

    @Override
    protected ModelAndView onSubmit(Object command) throws Exception {
        return new ModelAndView();
    }

}    

这是我的 myMessages.properties(类路径的根目录)

typeMismatch.command.age=typeMismatch.command.age
typeMismatch.age=typeMismatch.age
typeMismatch.java.lang.Integer=typeMismatch.java.lang.Integer
typeMismatch=typeMismatch

所以，我做了下面的测试

public class PersonControllerTest {

    private PersonController personController;
    private MockHttpServletRequest request;

    private MessageSource messageSource;

    @Before
    public void setUp() {
        request = new MockHttpServletRequest();
        request.setMethod("POST");

        personController = new PersonController();

        messageSource = new ResourceBundleMessageSource();
        ((ResourceBundleMessageSource) messageSource).setBasename("myMessages");
    }

    @Test
    public void failureSubmission() throws Exception {
        /**
         * Ops... a bindException
         * 
         * Age can not be a plain String, It must be a plain Integer
         */
        request.addParameter("age", "not a meaningful age");

        ModelAndView mav = personController.handleRequest(request, new MockHttpServletResponse());

        BindingResult bindException = (BindingResult) mav.getModel().get(BindingResult.MODEL_KEY_PREFIX + "command");
        for (Object object : bindException.getAllErrors()) {
            if(object instanceof FieldError) {
                FieldError fieldError = (FieldError) object;

                assertEquals(fieldError.getField(), "age");

                /**
                  * outputs typeMismatch.command.age
                  */
                System.out.println(messageSource.getMessage((FieldError) object, null));
            }
        }
    }

}

如果你想要第二个，你必须摆脱 typeMismatch.command.age 关键资源包

typeMismatch.age=typeMismatch.age
typeMismatch.java.lang.Integer=typeMismatch.java.lang.Integer
typeMismatch=typeMismatch

或者自己编写 MessageCodesResolver 的实现

public class MyCustomMessageCodesResolver implements MessageCodesResolver {

    private DefaultMessageCodesResolver defaultMessageCodesResolver = new DefaultMessageCodesResolver();

    public String [] resolveMessageCodes(String errorCode, String objectName) {
        if(errorCode.equals("age"))
            /**
              * Set up your custom message right here
              */
            return new String[] {"typeMismatch.age"};

        return defaultMessageCodesResolver.resolveMessageCodes(String errorCode, String objectName);
    }

    public void String[] resolveMessageCodes(String errorCode, String objectName, String field, Class fieldType) {
        if(errorCode.equals("age"))
            /**
              * Set up your custom message right here
              */
            return new String[] {"typeMismatch.age"};

        return defaultMessageCodesResolver.resolveMessageCodes(String errorCode, String objectName, String field, Class fieldType);
    }
}

并设置你的 PersonController

public class PersonController extends SimpleFormController {

    public PersonController() {
        setMessageCodesResolver(new MyCustomMessageCodesResolver());
        setCommandClass(Person.class);
        setValidator(new Validator() {
            public boolean supports(Class clazz) {
                return clazz.isAssignableFrom(Person.class);
            }

            public void validate(Object command, Errors errors) {
                rejectIfEmpty(errors, "age", "Age is required");
            }
        });
    }